Because Chopper roll Generally, a power supply with a cross-flow or steep-drop characteristic is used. Once the nozzle height increases, the current remains almost unchanged, the arc length increases, then the arc voltage increases, and finally the arc power increases. At the same time, the exposed arc length increases, and the energy loss of the arc column also increases. When cutting again, the blowing force of the cutting jet weakens, and the cutting ability decreases significantly. After cutting, there will be a lot of residue at the bottom of the cut, and the top will develop.

　　In actual cutting operations, in addition to arc stability, CNC chopper roll speed, and chopper roll travel accuracy, the influencing factors are the control and adjustment of the chopper roll cutting torch nozzle height. The chopper roll ionizes the high-temperature, high-speed airflow jet to form a conductor. When current passes through, the gas is guided to form a high-temperature arc, and then the heat of the arc is used with the help of the high-speed airflow to complete the cutting.

　　In daily use, the torch is frequently damaged and must be frequently replaced, which not only causes delays in construction but also implicitly increases investment costs; in addition, the torch height we mentioned earlier will inevitably affect the cutting quality and the service life of consumables. From this point of view, the nozzle height control of the chopper roll torch is directly related to the processing effect of the workpiece. Usually, the nozzle height refers to the distance between the nozzle end face and the cutting surface, which constitutes part of the entire arc length.

　　Torch height refers to the distance between the nozzle end face and the cutting surface. Generally, we usually use torch height control to adjust the cutting seam accuracy. In the cutting process, the height of the torch is part of the arc length, and the height of the arc length will affect the cutting seam. In addition, in the cutting process, the jet diameter expands outward after leaving the nozzle. The increase in torch nozzle height will inevitably increase the cutting width, which will ultimately affect the cutting speed and cutting quality.

　　Ceramic outer nozzles can also be selected. The advantage of using this type of nozzle is that the nozzle end face directly contacts the cutting surface, and there is no need to control the height, and the quality of the cutting product is also very good. In order to avoid the above problems, control the height of the chopper roll torch, and try to choose a smaller nozzle height, which can improve the cutting speed and ensure the quality of the cutting product. However, the nozzle height cannot be too low, otherwise a double arc will occur.